The two remaining sons resolved to leave the Grey Mountains with their people and settle elsewhere. As the elder brother, Thrór inherited the Kingship, and led his people back to Erebor in the southeast. Young Grór however traveled east, to the Iron Hills, where he founded a realm of his own becoming the first Lord of the Iron Hills.[1]

Lord of the Iron Hills, and Later Life

Grór saw many mishaps and tragedies during his rule. The kingdom of his brother Thrór was destroyed by the Dragon Smaug, and Grór's son and heir, Náin, was killed at the Battle of Nanduhirion before he could inherit. Grór's rule passed instead to his grandson.

However under Grór's leadership the Iron Hills also became the strongest of the realms in the North both economically and militarily, having the capability of standing between Sauron and his plans to destroy Rivendell and taking back the lands of Angmar. Their numbers were also boosted by many of their fellow Longbeards fleeing from the Sack of Erebor and later those wandering in exile.

Many years later, at the Battle of Five Armies, Thrór's last descendant, Thorin, was lost. Dáin II Ironfoot, Grór's grandson inherited the high Kingship of Durin's folk, a title that remained with the descendants of Grór.